Louis W. Herthum (born July 5, 1956) is an American actor and producer. Herthum has worked as a stage, television, and film actor, and he has also appeared in national television commercials. He is best known for his recurring role as Dep. Andy Broom on Murder, She Wrote and Peter Abernathy in the HBO television series Westworld.
Early life Louis W. Herthum was born and raised in Baton Rouge, Louisiana.
Career Acting Herthum started his career as an actor in 1978, performing in local theater, local and regional TV commercials and print advertisements. In 1991, after years of being an unfamiliar actor, he joined the cast of Murder, She Wrote; he played Deputy Andy Broom in 25 episodes of the show's final five seasons (1991–96). Before he played Broom, he played two other unrelated characters, beginning in 1989, his first television roles. He remained close to Angela Lansbury until her death in 2022. In 2015, he said in an interview that he saw her steal the show in the play, Blithe Spirit, at the Ahmanson Theater in Los Angeles, California, at the age of 89.
He has appeared in such television series as CSI, CSI: Miami, CSI: NY, NCIS, Criminal Minds, True Blood (joining the cast in 2011 for 7 of its 5th season's episodes), JAG, The Mentalist, Men of a Certain Age, True Detective, Treme, Breaking Bad, and The Gates. He appears in two ongoing television series during 2016. He plays Omar on the Netflix series Longmire, and Peter Abernathy, a host (robot) on the HBO series Westworld. After appearing in a recurring role in the first season of Westworld, Herthum was promoted to main cast in the second season. In June 2021, he joined the main cast on the Amazon Prime Video series The Peripheral.
His film credits include In the Electric Mist, The Curious Case of Benjamin Button, I Love You Phillip Morris, American Inquisition, The Open Road, Tekken, 12 Rounds, Seconds Apart and The Last Exorcism.
Producing In March 1996, after completing his final episode of Murder, She Wrote, Herthum turned his attention to film production and returned to his hometown of Baton Rouge to produce Favorite Son, his first feature film. Since then, his Baton Rouge-based production company, Ransack Films, has produced five feature films, one feature-length documentary (The Season Before Spring) and one short film ("The Grapevine").
Filmography
Film +YearTitleRoleNotes1982The ToyMan in BoxUncredited1997Favorite SonLucas Beauchamp2001The GhostBrowner2002Now You KnowCustomer2005The Rain MakersArt2006Road House 2Deputy Garland HendricksDirect-to-video2006Red RidgeNess2006NolaGannon2007PrideCoach Logan - 19642007The MistColonel Uncredited2008Lockjaw: Rise of the Kulev SerpentAlan CadeDirect-to-video2008American VioletOfficer Smith2008MutantsGriff Theriot2008The Curious Case of Benjamin ButtonMan at Caroline's Party2009I Love You Phillip MorrisDoctor2009In the Electric MistDoobie Patout200912 RoundsBEP Employee2009The Open RoadSurgeon2010Wrong Side of TownBriggsDirect-to-video2010TekkenTekken Police Officer #22010The Last ExorcismLouis Sweetzer2010Circle of PainWillyDirect-to-video2011Seconds ApartOwen Trimble2012Cheesecake CasseroleHoward2013Inventing AdamAdam's Father2013The Last Exorcism Part IILouis2014Atlas Shrugged Part III: Who Is John Galt?Wesley Mouch2015TruthBill Hollowell2017Be AfraidChief Martin Collins2018I Still See YouDr. Martin Steiner2018The Possession of Hannah GraceMan / Killer / Grainger2018City of LiesCity Attorney Stone
Television YearTitleRoleNotes1980Beulah LandParty Guest / Wounded Rebel Soldier2 episodes1984LouisianaFellow studentTelevision film1989HardballMargolisEpisode: "Which Witch Is Witch?"1989–1996Murder, She WroteVarious roles25 episodes1990Grand SlamCourt Room Security OfficerTelevision film1991ColumboTechnicianEpisode: "Caution: Murder Can Be Hazardous to Your Health"1995Vanishing SonLloydEpisode: "Birds of Paradise"1996The Tomorrow ManAir Force OfficerTelevision film; uncredited1998Vengeance UnlimitedConner Gulch2 episodes2001, 2003JAGCommunications Officer / Capt. Gilbert2006For One NightSheriff TaylorTelevision film2007The RichesTrooper YardleyEpisode: "Pilot"2007RuffianDr. HarthillTelevision film2008Racing for TimeRalph Connelly2008K-VilleMichael ShanleyEpisode: "Game Night"2008Living ProofDr. BanksTelevision film2009Men of a Certain AgeCoach FordEpisode: "Mind's Eye"2010TremeSheriff Don BabineauxEpisode: "Right Place, Wrong Time"2010Breaking BadRealtorEpisode: "Full Measure"2010The GatesSimon Ford2 episodes2010Cigarettes & Nylons David HunkeyTelevision film2010The DefendersJoe RodgersEpisode: "Nevada v. Rodgers"2010Journey to PrometheaAriTelevision film2011The MentalistChief Arnold NailEpisode: "Red Alert"2011CSI: Crime Scene InvestigationDetective Lucas MartinEpisode: "The List"2011Criminal MindsChief TheirsEpisode: "Hanley Waters"2011NCISErnest McCormickEpisode: "Restless"2011CSI: MiamiGrant WyattEpisode: "Blown Away"2012True BloodJD7 episodes2012CSI: NYCapt. Curtis SmithEpisode: "Reignited"2012–2016LongmireOmar8 episodes2013RevengeAgent GentryEpisode: "Truth: Part 2"2014Sleepy HollowGeneral George WashingtonEpisode: "The Indispensable Man"2014True DetectiveTerry GuidryEpisode: "Haunted Houses"2014StalkerJimmy LambertEpisode: "Manhunt"2015JustifiedDetective WillitsEpisode: "Fugitive Number One"2016The Night StalkerJedTelevision film2016–2018WestworldPeter Abernathy10 episodes2017Training DayHenry HollisterEpisode: "Blurred Lines"2017Downward DogWade2 episodes2017NarcosSenator ToyleEpisode: "Follow the Money"2017Law & Order True CrimeSgt. EdmondsEpisode: "The Menendez Murders: Episode 1"2017, 2018Chicago MedPat Halstead2 episodes2018Electric DreamsSupervisorEpisode: "Kill All Others"2018Hawaii Five-0CIA Agent Matt HarlowEpisode: "He Lokomaika'i Ka Manu O Kaiona"2018LuciferLt. John DeckerEpisode: "Once Upon a Time"2018Chicago FirePat HalsteadEpisode: "Going to War"2019What/IfFoster9 episodes2020FBI: Most WantedBlake WilsonEpisode: "Getaway"2020Dirty JohnJack EarleyEpisode: "Perception Is Reality"2020–2021All RiseSheriff Wayne McCarthy5 episodes2021–presentHome Before DarkSheriff Frank Briggs Sr.12 episodes2021HacksDennis2 episodes2022The PeripheralCorbell Pickett8 episodes2025–2026The Night AgentJacob MonroeMain role (season 2 and 3); 20 episodes
Video games +YearTitleRoleNotes2013DmC: Devil May CryMundus / Bob BarbasVoice
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